http://www.sciencedirect.com/science/article/pii/S1674987112001302

We present relative sea level （RSL） curves in Antarctica derived from glacial isostatic adjustment （GIA）predictions based on the melting scenarios of the Antarctic ice sheet since the Last Glacial Maximum （LGM）given in previous works.Simultaneously,Holocene-age RSL observations obtained at the raised beaches along the coast of Antarctica are shown to be in agreement with the GIA predictions.The differences from previously published ice-loading models regarding the spatial distribution and total mass change of the melted ice are significant.These models were also derived from GIA modelling; the variations can be attributed to the lack of geological and geographical evidence regarding the history of crustal movement due to ice sheet evolution.Next,we summarise the previously published ice load models and demonstrate the RSL curves based on combinations of different ice and earth models.The RSL curves calculated by GIA models indicate that the model dependence of both the ice and earth models is significantly large at several sites where RSL observations were obtained.In particular,GIA predictions based on the thin lithospheric thickness show the spatial distributions that are dependent on the melted ice thickness at each sites.These characteristics result from the short-wavelength deformation of the Earth.However,our predictions strongly suggest that it is possible to find the average ice model despite the use of the different models of lithospheric thickness.By sea level and crustal movement observations,we can deduce the geometry of the post-LGM ice sheets in detail and remove the GIA contribution from the crustal deformation and gravity change observed by space geodetic techniques,such as GPS and GRACE,for the estimation of the Antarctic ice mass change associated with recent global warming.     

���ڼ�ȨԼ����������ƽ��

?????ü???????????????????????????????????????????????????????χ²???????λ?????t??????????????????????????????t??????????????????????仯????????????????????????鷽??????1.05??????χ²???飻δ???????????????±13.6×10^-8ms^-2??17???????????????????仯??     

�����Ͷ�Ms5.1����ǰ���������仯

??2010?????????????????????????????????????6??2013??12??16???5.1????????????仯??????????????仯????????????仯?????????????????????з???,?????????1)?????????????????????????????????????飬????????仯????????????????????;2??2010????????????????仯??????????λ?仯??????????????????????仯????????????к?????????????????Ч????и?????????￡???????????仯??????????Щ?????;3????????????????????????????????????????????仯??????????????????????????????????仯?????????????????????????????仯???????????????????????????????????????????????????     

稀少控制的多源卫星影像区域网平差研究

利用多源卫星影像的联合区域平差技术,在控制点极少和影像纹理特征极差的情况下,实现更大覆盖范围的更高精度快速定位,具有重要的实际意义.本文研究了少控制弱连接的多卫星影像区域网平差的精度问题,利用P5和WorldView-I卫星影像,进行了缺少控制点和连接点的困难地区联合区域网定位实验,分析了不同情况下区域网平差对系统误差的改正效果.研究成果对测绘困难地区的工作有一定的参考意义.     

教学中消除限制条件的条件平差求解方法探讨

目前大多数的教材对附有限制条件的条件平差有现成的公式,但总体来说计算比较复杂.文章提出了一种新的方法,从消除限制条件出发,把非独立参数表达成独立参数的函数,从而把附有限制条件的条件平差转化为附有参数的条件平差,达到求解简单的目的.文章的研究也证明了目前有的教材删除附有限制条件平差的正确性.     

基于VC平台的高程控制网平差软件设计与实现

软件采用VC 6.0平台,基于MFC单文档工程,通过编写了闭合差计算、高程控制网间接平差与精度评定代码,实现了对原始数据的计算闭合差,间接平差与精度评定两个功能。实现数据处理软件化自动化运行,提高高程控制网数据处理和精度评定的效率,从而满足测绘专业工作人员的需要。     

广东省“三旧”改造地块数据库调整与更新技术研究

"三旧"(旧城镇、旧厂房、旧村庄)改造是广东省开展集约节约用地工作的一项重要内容和政策创新。首先介绍了"三旧"改造地块数据库调整与更新所涵盖的重要内容与方法,对"三旧"改造地块数据库调整与更新的过程进行了研究,提出了数据库调整与更新的技术路线,并且根据技术路线开发了集数据核查、数据更新及数据汇总等功能于一体的"三旧"数据管理系统,并在广东省开始应用。     

改进遗传算法在变形监测网平差中的应用

遗传算法在处理非线性最小二乘问题上具有其独到的优势。文中通过对遗传算法的理论性研究,对常规遗传算法的选择交叉策略、变异步长及变异率都作了改进。并将改进的遗传算法应用到变形监测网平差中,实现变形监测网在不同基准下的非线性平差计算,并通过实例证明其实用性及优越性。     

GPS数据处理软件的功能与性能分析

系统研究了常用的GPS数据处理软件的基线解算与网平差功能,并总结了软件的各自特点。研究结果表明,各软件解算短基线时精度很高,解算长基线时TBC软件与GAMIT的结果最为接近;并通过连续性的解算对比,得出基线解算误差远大于平差模型误差。     

激光干涉测距三维秩亏网的拟稳平差

激光跟踪仪采用激光干涉测距原理,其测距精度远远高于测角精度。利用激光跟踪仪的高精度激光干涉测距值,构成空间三维激光干涉测边网,可以消除测角误差对空间点位的影响,大幅度提高三维点坐标精度。由于激光干涉测距三维网存在数亏问题,且整网控制点的稳定性不同,因此采用秩亏自由网平差模型,分别以测站点和定向点为拟稳点对测量数据进行平差解算。平差结果表明,在拟稳点选择合理的情况下,空间点三维坐标平差值反算的距离与测量距离的差值优于±10μm;点位误差可以优于±20μm。